diff --git a/headroom/proxy/server.py b/headroom/proxy/server.py
index 3b5729337..4b74034da 100644
--- a/headroom/proxy/server.py
+++ b/headroom/proxy/server.py
@@ -2532,7 +2532,8 @@ if __name__ == "__main__":
         "--openai-api-url", help=f"Custom OpenAI API URL (default: {HeadroomProxy.OPENAI_API_URL})"
     )
     parser.add_argument(
-        "--anthropic-api-url", help=f"Custom Anthropic API URL (default: {HeadroomProxy.ANTHROPIC_API_URL})"
+        "--anthropic-api-url",
+        help=f"Custom Anthropic API URL (default: {HeadroomProxy.ANTHROPIC_API_URL})",
     )
 
     # Backend (anthropic direct, bedrock, openrouter, anyllm, or litellm-<provider>)
diff --git a/headroom/release_version.py b/headroom/release_version.py
index 00dccadf7..076fb75cb 100644
--- a/headroom/release_version.py
+++ b/headroom/release_version.py
@@ -9,8 +9,6 @@ from collections.abc import Sequence
 from dataclasses import dataclass, replace
 from pathlib import Path
 
-import tomllib
-
 SEMVER_RE = re.compile(r"^(\d+)\.(\d+)\.(\d+)$")
 RELEASE_TAG_RE = re.compile(r"^v(\d+)\.(\d+)\.(\d+)(?:\.(\d+))?$")
 
@@ -126,6 +124,11 @@ def compute_release_version(
 def get_canonical_version(root: Path) -> str:
     """Read the canonical project version from pyproject.toml."""
 
+    try:
+        import tomllib
+    except ModuleNotFoundError:  # pragma: no cover - Python 3.10 compatibility
+        import tomli as tomllib
+
     with open(root / "pyproject.toml", "rb") as file:
         data = tomllib.load(file)
     return data["project"]["version"]